Danfoss VLT HVAC Instructie - Pagina 4

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VLT® HVAC Basic Drive Casca...

1.1.1 System Status and Operation

Only when lead pump is working, the frequency converter

can go into sleep mode. When the Cascade Controller is

enabled, the operation status for each pump and the

Cascade Controller is displayed by 25-81, Pump Status and

25-80, Cascade Status on the LCP. Cascade Controller

information displayed includes:

1.1.2 Start/Stop Conditions

See 5-1* Digital Inputs.

Digital input commands

Start (SYSTEM START/STOP)

Lead Pump Start

Coast (EMERGENCY STOP)

External Interlock

Table 1.1 Commands Assigned to Digital Inputs

LCP keys

[Hand On]

[Off]

[Auto On]

Table 1.2 Function of Keys on LCP

1.1.3 Cascade Controller Parameter Detail

Parameter

25-00 Cascade

Controller

25-04 Pump

Cycling

VLT

Variable speed pump (lead)

Ramps up (if stopped and there is a

demand)

Ramps up if SYSTEM START is active

Coast to stop

Variable speed pump (lead)

Ramps up (if stopped by a normal stop

command) or stays in operation if already

running

Ramps down

Starts and stops according to commands via

terminals or serial bus cascade controller

only can work when drive in "Auto ON"

mode

Range

Default

Function

*[0] Disabled

*[0] Disabled Enable/disable

[1] Enabled

the cascade

controller which

is used for

staging multiple

pumps.

*[0] Disabled

*[0] Disabled Select the

[1] Enabled

method for

determining the

order of cutting

in/out the fixed

speed pumps.

MI18I302 - VLT

HVAC Basic Drive Cascade Controller

•

Pumps Status, is a read out of the status for the

relays assigned to each pump. The display shows

pumps that are disabled, off, running on the

frequency converter or running on the mains/

motor starter.

•

Cascade Status, is a read out of the status for the

Cascade Controller. The display shows the

Cascade Controller is disabled, all pumps are

running off, fixed speed pumps are being

staged/de-staged and lead pump alternation is

occurring.

Parameter

25-05 Fixed

Lead Pump

25-06 Number

of Pumps

is a registered Danfoss trademark

Fixed speed pumps (lag)

Staging (if stopped and there is a demand)

Not affected

Cut out (correspond relays, terminal 27/29

and 42/45)

Cut out (built-in relays are de-energized)

Fixed speed pumps (lag)

Destaging (if running)

Destaging

Staging/Destaging

Range

Default

Function

[0] No

*[1] Yes

Select if the lead

*[1] Yes

pump is fixed

(Yes) or can be

cycled (No).

2 - Expres-

Set the total

sionlimit (5)

number of

pumps including

the variable

speed pump.